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authorJason Liu <r64343@freescale.com>2013-01-11 14:31:47 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-17 08:50:43 -0800
commitc0b96525363543a1ba6a277546ebc26ad9a53aa1 (patch)
tree88515adb3db5516bc858a5ac00d941bfea786106 /mm
parentb1ca420793e505d04f3a47a74651af7c037774b7 (diff)
mm: compaction: fix echo 1 > compact_memory return error issue
commit 7964c06d66c76507d8b6b662bffea770c29ef0ce upstream. when run the folloing command under shell, it will return error sh/$ echo 1 > /proc/sys/vm/compact_memory sh/$ sh: write error: Bad address After strace, I found the following log: ... write(1, "1\n", 2) = 3 write(1, "", 4294967295) = -1 EFAULT (Bad address) write(2, "echo: write error: Bad address\n", 31echo: write error: Bad address ) = 31 This tells system return 3(COMPACT_COMPLETE) after write data to compact_memory. The fix is to make the system just return 0 instead 3(COMPACT_COMPLETE) from sysctl_compaction_handler after compaction_nodes finished. Signed-off-by: Jason Liu <r64343@freescale.com> Suggested-by: David Rientjes <rientjes@google.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Minchan Kim <minchan@kernel.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/compaction.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 459b0ab60524..3c8d7fe4410b 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -736,7 +736,7 @@ static int compact_node(int nid)
}
/* Compact all nodes in the system */
-static int compact_nodes(void)
+static void compact_nodes(void)
{
int nid;
@@ -745,8 +745,6 @@ static int compact_nodes(void)
for_each_online_node(nid)
compact_node(nid);
-
- return COMPACT_COMPLETE;
}
/* The written value is actually unused, all memory is compacted */
@@ -757,7 +755,7 @@ int sysctl_compaction_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
{
if (write)
- return compact_nodes();
+ compact_nodes();
return 0;
}